Pouring vessel

A pouring vessel comprising:

• a blow-molded, bottle-like container (1) consisting of an outer shell layer (5) and an inner layer(S), which are peelably laminated together, and having a body (2) of a cross-sectional shape in which an assumed symmetrical long axis (10) and a symmetrical short axis (11) are orthogonal with each other, said outer shell layer (6) forming an outer container (12), which has the flexibility to make this container squeezable and recoverable to its original shape, and said inner layer (6) forming an inner container (13) for receiving its content (7) inside and capable of being deflated avid deformed inward with the decrease in inner pressure;
• and
• a discharge cap (20) having an opening (23) and attached to neck (3) or the container (1);
• wherein a pair of vertical adhesive resin strips (9) is formed at both ends of the long axis (10) of the body (2), axisymmetrically on the central axis, by adhering the outer shell layer (6) and the inner layer (6) over the roughly entire height of the container (1), with the width (La) of said adhesive resin strips (9) being set in the range of 0.8(¼)(L−2D1) to 1.2({fraction (1/4)})(L−2D1), preferably at (¼)(L−2D1), wherein D1 is the length of the long axis in the cross-section of the body (2);
• and L is the peripheral length in the cross-section of body (2);
• wherein said discharge cap (20) is provided with the first check valve mechanism (25) that prevents the back flow of the content (7) from the opening (23) to the inner container (13) and also prevents the inflow of outside air;
• and
• wherein die outer container (12) is equipped with on outside air introduction mechanism (8) for introducing outside air into the interlaminar void (64) between the outer shell layer (5) and the inner layer (6), with the outside air introduction mechanism (8) being connected to the second check valve mechanism (26), which has a function to confine air within the void (64) at the time of squeeze.